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arXiv quant-ph/9908018quant-ph
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多能级系统中的非绝热跃迁

Non-adiabatic transitions in multi-level systems

Michael Wilkinson, Michael A. Morgan

摘要:

在一个哈密顿量平滑且缓慢变化的量子系统中,它在时间$t\to \pm \infty$处接近常数算符,绝热态之间的跃迁概率是指数小的。它们的特点是由一个指数,这取决于一个相位积分沿路径周围的一组分支点连接的能级表面在复杂的时间。只有某些分支点序列起作用。我们建议,这些序列是由一个拓扑规则涉及的斯托克斯线连接到分支点。我们的假设是支持的理论论据和数值实验的结果。

英文摘要:

In a quantum system with a smoothly and slowly varying Hamiltonian, which approaches a constant operator at times $t\to \pm \infty$, the transition probabilities between adiabatic states are exponentially small. They are characterized by an exponent that depends on a phase integral along a path around a set of branch points connecting the energy level surfaces in complex time. Only certain sequences of branch points contribute. We propose that these sequences are determined by a topological rule involving the Stokes lines attached to the branch points. Our hypothesis is supported by theoretical arguments and results of numerical experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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